Diagram of nerves in the thumb


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The median nerve is derived from the medial and lateral cords of the brachial plexus. It contains fibres from roots C6-T1, and can contain fibres from C5 in some individuals. After originating from the brachial plexus in the axillathe median nerve descends down the arm, initially lateral to the brachial artery.

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Proper palmar digital nerves of median nerve

Peripheral outside of the central nervous system nerves are tubes that are special in their ability to transmit electric impulses along their length and into or away from the central nervous system. Nerves have specialized receptors for different inputs like hot, cold, sharp and vibration. Smaller nerves are grouped into larger rope-like groups that travel up and down the body.

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Median nerve

In the palm of the hand the median nerve is covered by the skin and the palmar aponeurosisand rests on the tendons of the Flexor muscles. Immediately after emerging from under the transverse carpal ligament the median nerve becomes enlarged and flattened and splits into a smaller, lateral, and a larger, medial portion. The lateral portion supplies a short, stout branch to certain of the muscles of the ball of the thumbviz. Each proper digital nerveopposite the base of the first phalanx, gives off a dorsal branch which joins the dorsal digital nerve from the superficial branch of the radial nerveand supplies the integument on the dorsal aspect of the last phalanx.

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In this article, we shall look at the anatomy of the ulnar nerve — its anatomical course, motor and sensory functions, and its clinical correlations. After arising from the brachial plexus, the ulnar nerve descends down the medial aspect of the upper arm. In the forearm, the ulnar nerve pierces the two heads of the flexor carpi ulnarisand travels deep to the muscle, alongside the ulna.